[Xymon] Xymon no longer sending alerts

[Colin Coe]

Hi all

Our Xymon server has recently stopped sending alert emails. This server is
also running Postfix and is our mail relay.

>From alert.log all I see is:
2024-01-31 02:17:39.813610 Whoops ! Failed to send message (Select(2)
failed)
2024-01-31 02:17:39.829027 ->  Select failure while sending to Xymon
daemon at 10.10.10.10:1984
2024-01-31 02:17:39.829032 ->  Recipient '10.10.10.10', timeout 50
2024-01-31 02:17:39.829037 ->  1st line: 'config hosts.cfg'
2024-01-31 02:17:39.829042 Cannot load hosts.cfg from xymond: Select(2)
failed
2024-01-31 02:17:39.829049 Failed to load from xymond, reverting to
file-load
2024-01-31 02:22:40.932828 Whoops ! Failed to send message (Select(2)
failed)
2024-01-31 02:22:40.932863 ->  Select failure while sending to Xymon
daemon at 10.10.10.10:1984
2024-01-31 02:22:40.932867 ->  Recipient '10.10.10.10', timeout 50
2024-01-31 02:22:40.932871 ->  1st line: 'config hosts.cfg'
2024-01-31 02:22:40.932876 Cannot load hosts.cfg from xymond: Select(2)
failed
2024-01-31 02:22:40.932881 Failed to load from xymond, reverting to
file-load

And notifications.log is zero bytes in size.

I added "--debug" to the "[alert]" section of /etc/xymon/tasks.cfg and
while the verbosity was increased, there was no indication of why alerts
are not being sent.

Any clues how I can debug this?

Thanks
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